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You are not the first person I have heard from who wishes to upgrade the firmware only (not the entrie DCM) of a batch of SR300 cameras without having to do each one manually.
RealSense's firmware update can be launched from a command line instruction. So you could conceivably do it that way, by creating a batch processing script to launch the firmware on each of your machines (which I guess are on a network?). The name of the file to launch to update an SR300's firmware is:
This file is tricky to locate, as it is stored in the Windows system Temp folder and so seems to be given a unique directory location for each PC. Perhaps you could move the exe file to a permanent location that is the same on each PC once you have located it. The easiest way I found to find it was:
Open the C: > Windows > Temp folder
In the search box at the top of the folder window, type in the word plugins. It will then find the plugins folder buried somewhere within the Temp structure that contains the RealSense update exe.
Right-click on the plugins folder in the search results and select the 'Open folder location' menu option to go to the exact temp folder that the exe is in.
When you find the Plugins folder, the exe is inside a sub-folder called FWUpdateSR300.
Thanks MartyG! Your answer is very helpful to me.
I have found the "FWUpdateSR300.exe". But it is not under the path “C: > Windows > Temp”. I made a query on the entire C:\ drive and found it in "C:\ProgramData\Intel\Installer\rs_sdk_2014\cache\4f6dfe1e-80c5-11e6-b7da-2c44fd873b55\plugins\FWUpdateSR300" (it's wired...).
Hopefully one day the upgrade program will be an easy-to-use SDK tool like the SDK Information Viewer or Camera Explorer, because upgrading the firmware is really important to the developer.